Pedal-action for pianofortes.



N0- 7I3,995. Patented Nov. l8, I902.

J. KBUMSCHEID. I

PEDAL ACTION FOB PIANOFOBTES.

(Application filed Feb. 27, 1902.

(Ho Modal.)

wv-l MT 55 5.55: l \/E TEL WW WWW UNITED STATES PATENT OFFICE.

JACOB KRUMSCHEID, OF BOSTON, MASSACHUSETTS.

PEDAL-ACTION FOR PIANOFORTES.

SPECIFICATION forming part of Letters Patent No. 713,995, dated November18, 1902.

Application filed February 27, 1902. Serial No. 95,992. (No model.) I

To all wlwm, it may concern.-

Be it known that I, JACOB KRUMSCHEID, of Boston, in the county ofSufiolk and State of Massachusetts, have invented a new and usefulImprovement in Pedal-Actions for Pianofortes, of which the following,taken in connection with the accompanying drawings, is a specification.

Myinvention relates to the manner of forming the joints upon which thepedal-levers swing; and it consists in substituting springjoints ofpeculiar construction for the ordinary pivotal joints, the object beingto secure entire freedom from noise, either squeaking or rattling, andalso produce an inexpensive device. Theseobjects I attain by themechanism shown in the accompanying drawings, in which- Figure 1 showsmy pedal-action in plan. Fig. 2 is an elevation of the same. Fig. 3 is across-sectional view of the same. Fig. 4 shows one of the spring-jointpieces in plan. Fig. 5 shows a modification in vertical section.

In this action the foot-pedal A is made in any of the approved forms,its front end working in an opening, as shown at H, Fig. 2. The rear endis hung in a novel spring-piece B. (See Figs. 1 and 3.) Thisspring-piece is formed substantially as shown in Figs. 1 and 3, andconsists of a footpiece B, which is made fast to the base by screws orotherwise, a part B, and a horizontal part B The forward edge of thepart B is turned downward, as indicated at B so as to enter a saw-kerfmade across the upper side of the foot-pedal A. The part B that isturned down accurately fits the kerf, so that it serves to assist inholding the foot-pedal A in its exact position. A screw S firmly holdsthe end of the pedal to the spring-plate.

The foot-pedal A is connected to the long lever L by a screw-bolt O. Thesaid screwbolt 0 has at its upper end an adjusting-nut O, by which thedistance between the footpedal A and the long lever L may be accuratelyadjusted, and any degree of tension may be maintained between thefoot-pedal and the long lever.

The long lever L is tiltingly attached to the base-block D by means of awire spring bent as shown in Fig. 4, having eyes at F F for receivingscrews T T, by which it is fastened to the base-block D. A spring havingsome of the features of the one now being described is shown in myapplication for patent, Serial No. 62,418, filed May 29, 1901, and isnot claimed broadly in this application.

The novel features of the spring consist in extending the parts F and Foutward under the lever L, as shown, and in making the offset at N N,whereby a yielding tension is obtained. The extreme ends of the springare turned upward and forced into the lever L. When the members are allplaced and adj usted, a certain desired amount of tension can beobtained by simply turning the screwnut O on the bolt 0.

In Fig. 5 a modification is shown in which the upper fold of the springB is inserted into a kert' made in the end of the foot-pedal and issecured by a clam ping-screw at S.

I claim- 1. In a pedal-action for pianofortes, a footpedal kerfed asdescribed: a metallic platespring piece having a footpiece adapted to besecured to the base of the instrument; an upright part; and a horizontalpart so formed as to enter the said kerf in the foot-pedal and securedthereto, substantially as and for the purpose set forth.

2. In a pedal-action for pianofortes, a footpedal; a lever adapted to beoperated by said foot-pedal; a spring-wire adapted to tiltingly attachthe said lever to its base-piece, the said wire being bent as shown, soas to form means for attachment for the said base-piece,

having its ends inserted into the said lever,

and having a vertical ofiset whereby a yielding tension is secured,substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 15th day of February, A.D. 1902.

J AOOB KRUMSOHEID.

Witnesses FRANK BROWN, WILLIAM EDSON.

